﻿#region Copyright (c) 2009,2010, Active Web Solutions Ltd.
// Copyright (c) 2009,2010, Active Web Solutions Ltd
// All rights reserved.

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:

// * Redistributions of source code must retain the above copyright
//   notice, this list of conditions and the following disclaimer.

// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
//   documentation and/or other materials provided with the distribution.

// * Neither the name of Active Web Solutions Ltd nor the names of its
//   contributors may be used to endorse or promote products derived from
//   this software without specific prior written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion

using System.Configuration;
using System.Linq;

namespace Aws.SocketShifter
{
    public class ConnectionRules
    {
        // This could be made more sophisticated at some future date to 
        // provide ANY options and perhaps a DENY list too.

        string[] rules = null;

        public ConnectionRules()
        {
            // Rules are stored in the config file as a comma separated list of host:port
            // definitions.
            string allow = ConfigurationManager.AppSettings["allow"];

            // An empty list means no rules
            if (allow == "")
                return;

            rules = allow.Split(',');
            for (int i = 0; i < rules.Length; i++)
                rules[i]=rules[i].Trim();
        }

        public bool Check(string server, int port)
        {
            // If no rules then anything is allowed
            if (rules == null)
                return true;

            // If server:port isn't on the allow list then we refuse it
            return (rules.Contains(string.Format("{0}:{1}", server, port)));
        }
    }
}
